How is gnu.org?

Looks fine risk 0/100

Registered 31 years ago, on no blocklists we checked, valid HTTPS, the site answered 200 in 179 ms.

Why

02050100

finecarefulhigh risk

·Nothing in the checks added risk.

Rule-based: domain age, blocklists, TLS. A heuristic, not a guarantee.

The home page, rendered by how.is in a sandboxed browser. Nothing on it is clickable here.

Site

200

179 ms · ends at www.gnu.org

HTTPS

41 d

left on a Let's Encrypt certificate

Age

31 years

registered 1995-11-24

Blocklists

listings across 5 lists

Everything we looked at

DNS records6 record types

A	209.51.188.116
AAAA	2001:470:142:5::116
MX	10 eggs.gnu.org
NS	ns2.gnu.org ns1.gnu.org ns4.gnu.org
TXT	v=spf1 ip4:209.51.188.0/24 ip6:2001:470:142::/48 ip4:18.4.89.21 ip4:15.204.209.91 ip6:2604:2dc0:101:200::1d07 -all
CAA	{'type': 'CAA', 'issue': 'letsencrypt.org', 'critical': 0}

RegistrationGandi SAS

registrar	Gandi SAS
registered	1995-11-24
expires	2027-11-23
last changed	2026-09-29
owner	Free Software Foundation
nameservers	ns4.gnu.org ns1.gnu.org ns2.gnu.org
status	client transfer prohibited

registered 1995-11-24expires 2027-11-23

HTTPS certificate41 days left

valid	yes
issuer	Let's Encrypt
covers	classpath.org, digitalspeech.org, donate.digitalspeech.org, dotgnu.org, emacs.org, glibc.gnu.org, gnewsense.org, gnu.org, gnukids.org, gplfaq.org, hurd.gnu.org, ipv6.nongnu.org
protocol	TLSv1.3

issued 2026-09-07expires 2026-12-06

DNSSECinsecure

Domain is not signed with DNSSEC

. → org → gnu.org

Email authenticationgood

SPF	pass `v=spf1 ip4:209.51.188.0/24 ip6:2001:470:142::/48 ip4:18.4.89.21 ip4:15.204.209.91 ip6:2604:2dc0:101:200::1d07 -all`
DMARC	warning policy none
DKIM	found: selector1

Whether mail claiming to be from this domain can be checked as genuine.

Security scoregrade B · 163/205

Basic Security

10/40missing: DNSSEC Enabled, Nameserver Diversity

Record Security

38/45missing: DMARC Record, DKIM Presence

Advanced Security

20/25missing: Mail Server Configuration

Domain Reputation

50/50

Threat Detection

45/45missing: Domain Age Check

Blocklists0 listings · 5 lookups

SURBL MultidomainURIBL MultidomainSpamCop209.51.188.116Barracuda209.51.188.116UCEPROTECT Level 1209.51.188.116

Green: clean. Red: listed. Grey: the list did not answer.

Ask it yourself

Agents get this as data. Bought through the API, the checks behind this page cost $0.070: profile $0.025 + trust $0.020 + screenshot $0.020 + site status $0.005.

curl "https://how.is/v1/domain/trust?domain=gnu.org" \ -H "Authorization: Bearer $HOWIS_KEY" # or pay per call in USDC (x402), no key: the 402 tells your agent the price curl -i "https://how.is/v1/domain/profile?domain=gnu.org"

MCP: add https://how.is/mcp to Claude, Codex or Cursor (one-line install) and ask for domain_trust on gnu.org. Reference: /llms.txt.

Watch gnu.org. DNS read at the source every 5 minutes; certificate, blocklists and expiry every 6 hours. You get an email only when something changes.

Watch — $1 / 30 days